Semiconductor package

ABSTRACT

A semiconductor package including a redistribution substrate including an insulating layer and redistribution patterns in the insulating layer may be provided. Each of the redistribution patterns may include a via portion, a pad portion vertically overlapping the via portion, and a line portion extending from the pad portion. The via portion, the pad portion, and the line portion may be connected to each other to form a single object. A level of a bottom surface of the pad portion may be lower than a level of a bottom surface of the line portion. A width of the line portion may have a largest value at a level between a top surface of the line portion and the bottom surface of the line portion.

CROSS-REFERENCE TO RELATED APPLICATIONS

This U.S. non-provisional patent application claims priority under 35U.S.C. § 119 to Korean Patent Application Nos. 10-2020-0096176 and10-2021-0006217, filed on Jul. 31, 2020 and Jan. 15, 2021, respectively,in the Korean Intellectual Property Office, the entire contents of whichare hereby incorporated by reference.

BACKGROUND

The present disclosure relates to semiconductor packages, and inparticular, to semiconductor packages including a redistributionsubstrate and having an increased integration density and improvedreliability.

A semiconductor package is configured to easily use a semiconductor chipas a part of an electronic product. In general, the semiconductorpackage includes a printed circuit board (PCB) and a semiconductor chip,which is mounted on the PCB and is electrically connected to the PCB bybonding wires or bumps. With development of the electronic industry,many studies are being conducted to improve reliability of thesemiconductor package and to reduce a size of the semiconductor package.

SUMMARY

Some example embodiments of the inventive concepts provide semiconductorpackages having an increased integration density and improvedreliability.

According to an example embodiment of the inventive concepts, asemiconductor package may include a redistribution substrate includingan insulating layer and redistribution patterns in the insulating layer.Each of the redistribution patterns may include a via portion, a padportion vertically overlapping the via portion, and a line portionextending from the pad portion. The via portion, the pad portion, andthe line portion may be connected to each other to form a single object.A level of a bottom surface of the pad portion may be lower than a levelof a bottom surface of the line portion, and a width of the line portionmay have a largest value at a level between a top surface of the lineportion and the bottom surface of the line portion.

According to an example embodiment of the inventive concepts, asemiconductor package may include a redistribution substrate includingan insulating layer and redistribution patterns in the insulating layer.Each of the redistribution patterns may include a via portion, a padportion, and a line portion that are connected to each other to form asingle object. The pad portion may vertically overlap the via portionand the line portion may extend from the pad portion. A level of abottom surface of the pad portion may be lower than a level of a bottomsurface of the line portion. A side surface of the via portion may havea linear shape, and a side surface of the pad portion may have a roundedshape.

According to an example embodiment of the inventive concepts, asemiconductor package may include a lower redistribution substrateincluding an insulating layer and first redistribution patterns in theinsulating layer, a first semiconductor chip on the lower redistributionsubstrate, the first semiconductor chip including chip pads, firstconnection terminals being between and connecting the lowerredistribution substrate and the chip pads of the first semiconductorchip, a mold layer on the lower redistribution substrate to cover thefirst semiconductor chip, metal pillars around the first semiconductorchip to penetrate the mold layer and connected to the lowerredistribution substrate, and an upper redistribution substrate on themold layer may be provided. The upper redistribution substrate mayinclude an upper insulating layer and an upper redistribution pattern onthe upper insulating layer. Each of the first redistribution patternsmay include a first via portion, a first pad portion, and a first lineportion that are connected to each other to form a single object. Thefirst pad portion may vertically overlap the first via portion, and thefirst line portion may extend from the first pad portion. A level of abottom surface of the first line portion may be lowered with increasingdistance from a center portion of the first line portion in an outwarddirection.

BRIEF DESCRIPTION OF THE DRAWINGS

Example embodiments will be more clearly understood from the followingbrief description taken in conjunction with the accompanying drawings.The accompanying drawings represent non-limiting, example embodiments asdescribed herein.

FIGS. 1, 2, 3, 4, 5, 6, 7, 10, 11, 12, and 13 are sectional viewsillustrating a method of fabricating a semiconductor package accordingto an example embodiment of the inventive concepts.

FIG. 8 is a plan view exemplarily illustrating first and secondredistribution patterns of a redistribution substrate according to anexample embodiment of the inventive concepts.

FIGS. 9A, 9B, and 9C are enlarged sectional views respectivelyillustrating portions aa, bb, and cc of FIG. 7.

FIG. 14 is a sectional view illustrating a semiconductor packageaccording to an example embodiment of the inventive concepts.

FIG. 15 is an enlarged sectional view illustrating a portion dd of FIG.14.

FIG. 16 is a sectional view illustrating a semiconductor packageaccording to an example embodiment of the inventive concepts.

FIG. 17 is an enlarged sectional view illustrating a portion ee of FIG.16.

FIG. 18 is a sectional view illustrating a semiconductor packageaccording to an example embodiment of the inventive concepts.

FIG. 19 is a plan view schematically illustrating a semiconductorpackage according to an example embodiment of the inventive concepts.

FIG. 20 is a sectional view, which is taken along a line I-I′ of FIG. 19to illustrate a semiconductor package according to an example embodimentof the inventive concepts.

It should be noted that these figures are intended to illustrate thegeneral characteristics of methods, structure and/or materials utilizedin certain example embodiments and to supplement the written descriptionprovided below. These drawings are not, however, to scale and may notprecisely reflect the precise structural or performance characteristicsof any given embodiment, and should not be interpreted as defining orlimiting the range of values or properties encompassed by exampleembodiments. For example, the relative thicknesses and positioning ofmolecules, layers, regions and/or structural elements may be reduced orexaggerated for clarity. The use of similar or identical referencenumbers in the various drawings is intended to indicate the presence ofa similar or identical element or feature.

DETAILED DESCRIPTION

Example embodiments of the inventive concepts will now be described morefully with reference to the accompanying drawings, in which some exampleembodiments are shown.

While the term “same,” “equal,” or “identical” is used in description ofexample embodiments, it should be understood that some imprecisions mayexist. Thus, when one element is referred to as being the same asanother element, it should be understood that an element or a value isthe same as another element within a desired manufacturing oroperational tolerance range (e.g., ±10%). Similarly, when the terms“about” or “substantially” are used in this specification in connectionwith a numerical value, it is intended that the associated numericalvalue includes a manufacturing or operational tolerance (e.g., ±10%)around the stated numerical value. Moreover, when the words “generally”and “substantially” are used in connection with geometric shapes, it isintended that precision of the geometric shape is not required but thatlatitude for the shape is within the scope of the disclosure. Further,regardless of whether numerical values or shapes are modified as “about”or “substantially,” it will be understood that these values and shapesshould be construed as including a manufacturing or operationaltolerance (e.g., ±10%) around the stated numerical values or shapes.

FIGS. 1, 2, 3, 4, 5, 6, 7, 10, 11, 12, and 13 are sectional viewsillustrating a method of fabricating a semiconductor package accordingto an example embodiment of the inventive concepts.

Referring to FIG. 1, an adhesive layer ADL may be formed on a carriersubstrate CR. The carrier substrate CR may be a glass substrate. Theadhesive layer ADL may be a polymer tape, which is formed of orincludes, for example, an insulating material. In an example embodiment,a metal layer may be formed to protect the carrier substrate CR beforethe formation of the adhesive layer ADL.

A first insulating layer 10 may be formed on the adhesive layer ADL. Theformation of the first insulating layer 10 may include performing acoating process (e.g., a spin coating process or a slit coating process)and performing a curing process. The first insulating layer 10 may beformed of or include at least one of photo-imageable dielectricmaterials. The first insulating layer 10 may include, for example, aphoto-imageable polymer. The photo-imageable polymer may include atleast one of, for example, photo-imageable polyimide, polybenzoxazole,phenol-based polymers, or benzocyclobutene-based polymers.

A first hard mask layer HM1 may be formed on the first insulating layer10. The first hard mask layer HM1 may be formed of or include a materialthat is chosen to have an etch selectivity with respect to the firstinsulating layer 10. The first hard mask layer HM1 may be formed of orinclude at least one of metallic materials (e.g., titanium, titaniumnitride, tantalum, tantalum nitride, or tungsten). As an example, thefirst hard mask layer HM1 may be formed of or include titanium.

A first photoresist pattern PR1 may be formed on the first hard masklayer HM1. The formation of the first photoresist patterns PR1 mayinclude forming a photoresist layer on the first hard mask layer HM1 andperforming exposing and developing processes on the photoresist layer.

Referring to FIGS. 1 and 2, the first hard mask layer HM1 may bepatterned using the first photoresist pattern PR1 as an etch mask.Thereafter, the first insulating layer 10 may be patterned using thepatterned first hard mask layer HM1 as an etch mask. The patterningprocesses may include, for example, a dry etching process. As a resultof the patterning process, a plurality of openings OP may be formed topenetrate the first insulating layer 10.

After the patterning process of the first insulating layer 10 and thefirst hard mask layer HM1, the first photoresist pattern PR1 and theremaining portion of the first hard mask layer HM1 may be removed. In anexample embodiment, the remaining portion of the first hard mask layerHM1 may be removed by a wet etching process.

Next, a seed/barrier layer 11 may be formed on the first insulatinglayer 10 and the adhesive layer ADL. The seed/barrier layer 11 may beformed of or include at least one of conductive materials (e.g.,copper/titanium (Cu/Ti)). A metal layer 13 may be formed on theseed/barrier layer 11 to fill the openings OP in the first insulatinglayer 10. The metal layer 13 may be formed of or include at least one ofmetallic materials (e.g., copper) and may be extended to a region on atop surface of the first insulating layer 10. The metal layer 13 may beformed by an electroplating process using the seed/barrier layer 11 asan electrode.

Referring to FIG. 3, a planarization process may be performed on theseed/barrier layer 11 and the metal layer 13 to form an under-bumppattern UBM. The under-bump pattern UBM may include a seed/barrierpattern BP and a metal pattern MP. As a result of the planarizationprocess, the seed/barrier layer 11 and the metal layer 13 may form theseed/barrier pattern BP and the metal pattern MP, respectively. Theseed/barrier pattern BP may be disposed in the first insulating layer 10and may be disposed between a bottom surface of the metal pattern MP andthe first insulating layer 10 and between a side surface of the metalpattern MP and the first insulating layer 10.

In an example embodiment, the planarization process may be performedusing a chemical mechanical polishing process. The planarization processmay be performed until the top surface of the first insulating layer 10is exposed.

Referring to FIG. 4, a second insulating layer 20 including preliminaryvia holes PVH may be formed on the first insulating layer 10. The secondinsulating layer 20 may include the same or similar photo-imageabledielectric material as the first insulating layer 10. The preliminaryvia holes PVH may be formed to expose portions of the under-bump patternUBM. The preliminary via holes PVH may be formed by performing exposingand developing processes on the second insulating layer 20. Thereafter,a curing process may be performed on the second insulating layer 20

A second hard mask layer HM2 may be formed on the second insulatinglayer 20 provided with the preliminary via holes PVH. The second hardmask layer HM2 may conformally cover inner surfaces of the preliminaryvia holes PVH and a top surface of the second insulating layer 20. Thesecond hard mask layer HM2 may cover top surfaces of the under-bumppatterns UBM exposed through the preliminary via holes PVH. A secondphotoresist pattern PR2 may be formed on the second hard mask layer HM2.The second photoresist patterns PR2 may be formed by forming aphotoresist layer on the second hard mask layer HM2 and performingexposing and developing processes on the photoresist layer.

The second photoresist pattern PR2 may be formed to have openingsexposing portions of the second hard mask layer HM2. The secondphotoresist pattern PR2 may include a first opening region R1, a secondopening region R2, a third opening region R3, and a fourth openingregion R4.

The first opening region R1 may define a region, in which a first trenchto be described below will be formed. The second opening region R2 maydefine a region, in which a second trench will be formed. The thirdopening region R3 may define a region, in which a third trench will beformed. The fourth opening region R4 may define a region, in which afourth trench will be formed. The first opening region R1 may verticallyoverlap the preliminary via hole PVH.

Referring to FIGS. 4 and 5, an anisotropic etching process may beperformed on the second hard mask layer HM2, using the secondphotoresist pattern PR2 as an etch mask. Accordingly, a hard maskpattern HMP may be formed on the second insulating layer 20. Theanisotropic etching process on the second hard mask layer HM2 may beperformed using at least one of a reactive ion etching (RIE) process, amagnetically-enhanced reactive ion etching (MERIE) process, aninductively-coupled plasma (ICP) etching process, a transformer coupledplasma (TCP) etching process, a hollow anode-type plasma etchingprocess, or a helical resonator plasma etching process.

Next, an anisotropic etching process may be performed on the secondinsulating layer 20, using the hard mask pattern HMP as an etch mask.

Accordingly, first to fourth trenches T1, T2, T3, and T4 may be formedin the second insulating layer 20, and via holes VH may be formed toexpose the under-bump pattern UBM. The first trench T1, the secondtrench T2, the third trench T3, and the via hole VH may be connected toeach other. Each of the first and third trenches T1 and T3 may be shapedlike a circular hole, when viewed in a plan view. The second trench T2may be a line-shaped region that extends in a first direction D1 and/ora second direction D2. The fourth trench T4 may be a line-shaped regionthat extends in the first direction D1 and/or the second direction D2.In FIG. 5, the section of the second trench T2 extending in the firstdirection D1 is indicated by the reference number T2 a, and the sectionof the second trench T2, which linearly extends in the second directionD2, is indicated by the reference number T2 b. The section of the fourthtrench T4, which extends in the second direction D2, is illustrated asan example. A width of each of the first, third, fourth trenches T1, T2,and T4 may be larger than a width of the second trench T2.

Due to a loading effect, which may occur in a process of forming thefirst and second trenches T1 and T2 of different widths, the secondtrenches T2 may have a depth that is different from a depth of the firsttrenches T1. In an example embodiment, the depth of the first trenchesT1 may be larger than the depth of the second trenches T2. The thirdtrench T3 and the fourth trench T4 may have widths larger than thesecond trenches T2. The depth of the third trench T3 and the depth ofthe fourth trench T4 may be larger than the depth of the second trenchT2.

Because the first trenches T1 are formed after the formation of thepreliminary via holes PVH of FIG. 4, a corner portion, at which thepreliminary via hole PVH and the first trench T1 are connected to eachother, may have a round surface or an inclined surface, during theanisotropic etching of the second insulating layer 20. The cornerportion may have a varying profile which defines a width in the D1direction to vary along a vertical direction (e.g., along the D3direction).

Further, lower corners of the second trenches T2 may be rounded and alevel of a center portion of a bottom surface of the each of the secondtrenches T2 may be higher than a level of an edge portion of the bottomsurface of a corresponding one of the second trenches T2.

Furthermore, due to a bowing effect, which may occur in the etchingprocess to form the first to fourth trenches T1 to T4, the first tofourth trenches T1 to T4 may have rounded side surfaces. For example,the first to fourth trenches T1 to T4 may have laterally convex sidesurfaces.

Referring to FIG. 6, the second photoresist pattern PR2 and the hardmask pattern HMP may be removed. The second photoresist pattern PR2 maybe removed using a strip process. The hard mask pattern HMP may beremoved using a wet etching process.

Thereafter, the seed/barrier layer 11 and the metal layer 13 may besequentially formed to fill the via holes VH and the first to fourthtrenches T1 to T4.

The seed/barrier layer 11 may be deposited on the second insulatinglayer 20, in which the via holes VH and the first to fourth trenches T1to T4 are formed, to have a substantially uniform thickness. In otherwords, the seed/barrier layer 11 may be disposed to conformally coverinner surfaces of the via holes VH, inner surfaces of the first tofourth trenches T1 to T4, and the top surface of the second insulatinglayer 20. The seed/barrier layer 11 may be formed by a PVD, CVD, or ALDprocess.

The metal layer 13 may be formed to fully fill the via holes VH and thefirst to fourth trenches T1 to T4 provided with the seed/barrier layer11. The metal layer 13 may also be formed on the top surface of thesecond insulating layer 20. The metal layer 13 may be formed by anelectroplating process.

Referring to FIG. 7, a planarization process may be performed on themetal layer 13 and the seed/barrier layer 11 to expose the top surfaceof the second insulating layer 20. The planarization process may beperformed using a chemical mechanical polishing (CMP) process. Firstredistribution patterns RDL1 and second redistribution patterns RDL2,which are separated from each other, may be formed by the planarizationprocess. Each of the first and second redistribution patterns RDL1 andRDL2 may include the seed/barrier pattern BP and the metal pattern MP.

The first redistribution patterns RDL1 may be lines, which are used todeliver signals, and the second redistribution patterns RDL2 may bedummy lines or power lines connected to a power.

The first and second redistribution patterns RDL1 and RDL2 may have topsurfaces that are substantially flat or even. Further, the top surfacesof the second redistribution patterns RDL2 may be substantially coplanarwith the top surface of the second insulating layer 20 s.

FIG. 8 is a plan view schematically illustrating the first and secondredistribution patterns.

Referring to FIGS. 7 and 8, the first redistribution pattern RDL1 mayinclude a first via pad portion VP1, a first line portion L1, and afirst connection pad portion CP1. A first via portion V1 may be providedto penetrate the second insulating layer 20. The first via pad portionVP1 may be connected to the first via portion V1 and may be disposed inthe second insulating layer 20. The first connection pad portion CP1 maybe connected to an end portion of the first line portion L1 and may bedisposed in the second insulating layer 20. The first line portions L1may extend in the first direction D1 and/or the second direction D2 andmay be spaced apart from each other.

The first redistribution pattern RDL1 may have the smallest width(hereinafter, a first width W1) at the first line portion L1, and thefirst width W1 may be within a range of about 0.5 μm to about 2.0 μm.The first line portions L1 may be spaced apart from each other by afirst distance S1. The first distance S1 and the first width W1 may besubstantially equal to each other.

In an example embodiment, the second redistribution pattern RDL2 mayhave a shape similar to the first redistribution pattern RDL1, exceptthat the second redistribution pattern RDL2 has a width larger than thefirst redistribution pattern RDL1. The second redistribution patternRDL2 may include a second via pad portion VP2, a second line portion L2,and a second connection pad portion CP2. Although not shown, a secondvia portion V2 may be provided to penetrate the second insulating layer20. The second via pad portion VP2 may be connected to the second viaportion V2 and may be disposed in the second insulating layer 20. Thesecond connection pad portion CP2 may be connected to an end portion ofthe second line portion L2 and may be disposed in the second insulatinglayer 20. The second redistribution pattern RDL2 may have the smallestwidth (hereinafter, a second width W2) at the second line portion L2,and the second width W2 may be within a range of about 3.0 μm to about10.0 μm.

FIGS. 9A, 9B, and 9C are enlarged sectional views respectivelyillustrating portions aa, bb, and cc of FIG. 7.

Referring to FIGS. 7 and 9A, each of the first redistribution patternsRDL1 may include the seed/barrier pattern BP and the metal pattern MP.The seed/barrier pattern BP may be provided to cover the side and bottomsurfaces of the metal pattern MP.

A first thickness H1 of the first via pad portion VP1 of the firstredistribution pattern RDL1 may be larger than a second thickness H2 ofthe first line portion L1. The first thickness H1 may range from about3.0 μm to 4.3 μm, and the second thickness H2 may range from 2.7 μm to3.5 μm. A bottom surface B1 of the first via pad portion VP1 may belocated at a level lower than a bottom surface B2 of the first lineportion L1. A difference LV1 in the level between the bottom surface B1of the first via pad portion VP1 and the bottom surface B2 of the firstline portion L1 may range from about 0.3 μm to 0.8 μm. In the firstredistribution pattern RDL1, the first via pad portion VP1 and the firstline portion L1 may have top surfaces that are substantially coplanarwith the top surface of the second insulating layer 20. The first viapad portion VP1 and the first line portion L1 may have rounded sidesurfaces VPS and LS, respectively. The side surfaces VPS and LS of thefirst via pad portion VP1 and the first line portion L1 may be laterallyconvex. A side surface VS of the first via portion V1 may have arelatively linear shape.

An angle between the side surface VS of the first via portion V1 and abottom surface B3 of the first via portion V1 may be greater than 95°.According to an example embodiment of the inventive concepts, the sidesurface VS of the first via portion V1 may have a linear shape, whereasthe side surface VPS of the first via pad portion VP1 may have a roundedshape. This is because, as described with reference to FIGS. 4 and 5,the via hole VH is formed by a photo-patterning process and the firsttrench T1 is formed by an etching process.

An edge portion EG, at which the side surface VPS of the first via padportion VP1 and the side surface VS of the first via portion V1 areconnected to each other, may have a rounded shape. In other words, thebottom surface of the first pad portion VP1 and the side surface of thefirst via portion V1 are connected to form an edge portion having arounded shape. As described with reference to FIG. 5, the cornerportion, at which the via hole VH and the first trench T1 are connectedto each other, may be more easily etched during the anisotropic etchingof the hard mask pattern HMP, thereby having an inclined surface. Thecorner portion may define a width in the D1 direction that varies alonga vertical direction (e.g., along the D3 direction).

The metal pattern MP may have a groove portion GP near the seed/barrierpattern BP or near an edge of the top surface of the first line portionL1. The groove portion GP may have a depth that is greater than 0 nm andis smaller than 300 nm.

This may be because an etch rate of the metal pattern MP is relativelyhigh at an interface between the metal pattern MP and the seed/barrierpattern BP, during the chemical-mechanical planarization process of FIG.7.

A diameter CPW of the first via pad portion VP1 may be 1.5 or more timeslarger than the first width W1 of the first line portion L1. Thediameter CPW of the first via pad portionVP1 has the largest value at alevel between a top surface of the first via pad portion VP1 and thebottom surface of the first via pad portion VP1.

Referring to FIGS. 8 and 9B, the side surface VS of the first viaportion V1 may include a lower sidewall portion VSB having a first slopeand an upper sidewall portion VSU having a second slope. An inflectionpoint N1, at which the slope varies, may exist between the lowersidewall portion VSB and the upper sidewall portion VSU. The absolutevalue of the first slope may be greater than the absolute value of thesecond slope. For example, an angle of the first slope may be smallerthan 90°.

The upper sidewall portion VSU may be connected to the bottom surface B3of the first via pad portion VP1 via the lower sidewall portion VSB. Thelower sidewall portion VSB and the upper sidewall portion VSU may have asubstantially linear shape.

As described with reference to FIG. 5, the corner portion, at which thevia hole VH and the first trench T1 are connected to each other, may bemore easily etched during the anisotropic etching of the hard maskpattern HMP, and thus the upper sidewall portion VSU may be formed tohave a smaller slope than the lower sidewall portion VSB. The cornerportion may define a width in the D1 direction that varies along avertical direction (e.g., along the D3 direction).

Referring to FIGS. 8 and 9C, the first line portion L1 of the firstredistribution pattern RDL1 and the second line portion L2 of the secondredistribution pattern RDL2 may be laterally convex.

For example, the first line portion L1 of the first redistributionpattern RDL1 may have the smallest width (hereinafter, the first widthW1) at a level of the top or bottom surface of the first line portionL1. Further, the first line portion L1 of the first redistributionpattern RDL1 may have the largest width P1 at a level between the topsurface and the bottom surface thereof. In the first line portion L1 ofthe first redistribution pattern RDL1, a difference between the largestwidth P1 and the smallest width W1 (e.g., a width of the top surface ofthe first line portion L1 and/or a width of the bottom surface of thefirst line portion L1) may be greater than 0 nm and smaller than orequal to 300 nm.

The second line portion L2 of the second redistribution pattern RDL2 mayalso have the smallest width (hereinafter, the second width W2) at alevel of the top or bottom surface of the second line portion L2.

A difference LV2 between a level of the bottom surface B2 of the firstline portion L1 of the first redistribution pattern RDL1 and a level ofa bottom surface B4 of the second line portion L2 of the secondredistribution pattern RDL2 may be greater than 0 μm and may be smallerthan 0.5 μm.

The level of the bottom surface of the first line portion L1 of thefirst redistribution pattern RDL1 may be lowered with increasing adistance from the center portion of the first line portion L1 in anoutward direction. In other words, the level of the bottom surface ofthe first line portion L1 of the first redistribution pattern RDL1 maybe highest at the center portion of the first line portion L1. Adifference in the level between the center and edge portions of thebottom surface of the first line portion L1 may be greater than 0 nm andmay be smaller than 300 nm.

This may be because an edge portion of the second insulating layer 20,which is exposed in the process of etching the second insulating layer20 using the hard mask pattern HMP of FIGS. 4 and 5, is more etched.

An edge portion of the bottom surface of the first line portion L1 ofthe first redistribution pattern RDL1 may have a rounded shape. As anexample, the edge portion of the bottom surface of the first lineportion L1 of the first redistribution pattern RDL1 may have a curvatureradius RA of 0.3 μm or larger.

According to an example embodiment of the inventive concepts, the firstredistribution pattern RDL1 may include the seed/barrier pattern BP andthe metal pattern MP, as described above, and the seed/barrier patternBP may be disposed between the metal pattern MP and the secondinsulating layer 20 to mitigate or prevent the metal pattern MP fromreacting with the material of the second insulating layer 20 and therebymitigating or preventing the metal pattern MP from being oxidized. Thus,for a fine line (e.g., the first redistribution pattern RDL1) used todeliver signals, the mitigation or prevention of the oxidation may makeit possible to improve reliability of the device.

Referring to FIG. 10, a third insulating layer 30 may be formed on thesecond insulating layer 20 to cover the top surfaces of the first andsecond redistribution patterns RDL1 and RDL2.

The third insulating layer 30 may be formed of or include at least oneof photo-imageable dielectric materials. As an example, the thirdinsulating layer 30 may be formed of or include the same polymermaterial as the second insulating layer 20.

Next, the via holes VH may be formed in the third insulating layer 30 toexpose portions of the first redistribution patterns RDL1. In the casewhere the third insulating layer 30 includes a photo-imageable polymer,the via holes VH may be formed by performing exposing and developingprocesses on portions of the third insulating layer 30. A curing processmay be performed on the third insulating layer 30, after the formationof the via holes VH.

The first and second redistribution patterns RDL1 and RDL2 may be formedon the third insulating layer 30, like the first and secondredistribution patterns RDL1 and RDL2 formed on the second insulatinglayer 20.

Referring to FIG. 11, a fourth insulating layer 40 may be formed on thethird insulating layer 30. The fourth insulating layer 40 may be formedof or include at least one of photo-imageable polymers.

By performing exposing and developing processes on portions of thefourth insulating layer 40, the via holes VH may be formed to exposeportions of the first and second redistribution patterns RDL1 and RDL2provided in the third insulating layer 30.

Thereafter, the seed/barrier layer 11 may be formed to conformally covera surface of the fourth insulating layer 40 with the via holes VH. Athird photoresist pattern PR3 may be formed on the seed/barrier layer 11to have a plurality of openings. The openings of the third photoresistpattern PR3 may overlap the via holes VH of the fourth insulating layer40.

Referring to FIG. 11, an electroplating process may be performed to forma first bonding pad pattern 44 and a second bonding pad pattern 46 inthe openings of the third photoresist pattern PR3. In an exampleembodiment, the first bonding pad pattern 44 may be formed of or includecopper, and the second bonding pad pattern 46 may be formed of orinclude at least one of metals (e.g., nickel (Ni) and gold (Au)) oralloys thereof or may have a multi-layered structure containing at leastone of metals (e.g., nickel (Ni) and gold (Au)).

Referring to FIG. 12, the third photoresist pattern PR3 may be removedusing a strip process. Next, the seed/barrier layer 11 on the topsurface of the fourth insulating layer 40 may be etched using a wetetching process. Accordingly, bonding pads 48 including the seed/barrierpattern BP, the first bonding pad pattern 44, and the second bonding padpattern 46 may be formed.

Thereafter, connection terminals 150 may be attached on the bonding pads48 to connect a semiconductor chip 100 to a redistribution substrate300.

Referring to FIG. 13, the carrier substrate CR and the adhesive layerADL may be removed. Next, the seed/barrier pattern BP on the bottomsurface of the metal pattern MP may be removed to expose the bottomsurface of the metal pattern MP provided in the first insulating layer10. The seed/barrier pattern BP may be selectively interposed betweenthe first insulating layer 10 and the metal pattern MP, and theredistribution substrate 300 may be formed by attaching an outerconnection terminal 390 to the exposed bottom surface of the metalpattern MP.

The semiconductor package may include the redistribution substrate 300and the semiconductor chip 100, which is disposed on the redistributionsubstrate 300. In an example embodiment, data signals and controlsignals may be provided to the first redistribution patterns RDL1 whoseline portions each have the smallest width (e.g., the first width W1) atthe top or bottom surface thereof.

A power voltage and a ground voltage may be provided to the secondredistribution patterns RDL2 whose line portions each have the smallestwidth (e.g., the second width W2 larger than the first width W1) at thetop or bottom surface thereof.

FIG. 14 is a sectional view illustrating a semiconductor packageaccording to an example embodiment of the inventive concepts. FIG. 15 isan enlarged sectional view illustrating a portion dd of FIG. 14.

For the sake of brevity, the elements and features of this example thatare similar to those previously shown and described will not bedescribed in much further detail.

Referring to FIGS. 14 and 15, a semiconductor package 1 according to thepresent example embodiment may include a first semiconductor package PK1and a second semiconductor package PK2, which is disposed on the firstsemiconductor package PK1.

The first semiconductor package PK1 may include lower and upperredistribution substrates 300L and 300U, a first semiconductor chip 100,metal pillars 306, and a mold layer 370.

As an example, referring to FIG. 16, the lower redistribution substrate300L may include first to sixth insulating layers 310, 320, 330, 340,350, and 360, which are sequentially stacked. In an example embodiment,the first to sixth insulating layers 310, 320, 330, 340, 350, and 360may be observed as a single insulating layer.

The under-bump patterns UBM described above may be provided in the firstinsulating layer 310. The first and second redistribution patterns RDL1and RDL2 described above may be provided in the second to fifthinsulating layer 320 to 350. A lower bonding pad 48, which is the sameas or substantially similar to the bonding pad 48 described above, maybe provided in the sixth insulating layer 360. The lower bonding pad 48may correspond to the bonding pad 48 described above. The lower bondingpad 48 may include a first lower bonding pad 48a and a second lowerbonding pad 48b. In other words, the first and second redistributionpatterns RDL1 and RDL2 may be configured to have the same as orsubstantially similar to the features described above with reference toFIGS. 7, 8, and 9A to 9C.

Referring back to FIG. 14, the first semiconductor chip 100 may beprovided on the lower redistribution substrate 300L. The firstsemiconductor chip 100 may be disposed in a center region of the lowerredistribution substrate 300L, when viewed in a plan view. A pluralityof chip pads 111 may be disposed on a bottom surface of the firstsemiconductor chip 100. The first semiconductor chip 100 may be disposedin such a way that the bottom surface thereof face the top surface ofthe lower redistribution substrate 300L. The first connection terminals150 may be disposed between and attached to the chip pads 111 of thefirst semiconductor chip 100 and the uppermost ones of theredistribution patterns RDL1 and RDL2 of the lower redistributionsubstrate 300L. The chip pads 111 of the first semiconductor chip 100may be connected to the first lower bonding pad 48a and theredistribution patterns RDL1 and RDL2 of the lower redistributionsubstrate 300L through the first connection terminals 150.

The metal pillars 306 may be disposed around the first semiconductorchip 100 and may electrically connect the lower redistribution substrate300L to the upper redistribution substrate 300U. The metal pillars 306may be provided to penetrate the mold layer 370 and may have topsurfaces that are coplanar with the top surface of the mold layer 370.Bottom surfaces of the metal pillars 306 may be in direct contact withthe second lower bonding pad 48 b.

The mold layer 370 may be provided between the lower and upperredistribution substrates 300L and 300U to cover the first semiconductorchip 100. The mold layer 370 may be provided on the top surface of thelower redistribution substrate 300L to cover the side and top surfacesof the first semiconductor chip 100. The mold layer 370 may fill a spacebetween the metal pillars 306, and a thickness of the mold layer 370 maybe substantially equal to a length of the metal pillars 306. The moldlayer 370 may be formed of or include at least one of insulatingpolymers (e.g., epoxy molding compound).

The second connection terminals 390 may be attached to the under-bumppatterns UBM. The second connection terminals 390 may be solder balls,which are formed of tin, lead, copper, or the like.

The second semiconductor package PK2 may be disposed on the upperredistribution substrate 300U. In an example embodiment, the upperredistribution substrate 300U may include upper insulating layers 310U,320U, and 330U, upper redistribution patterns RDL, and an upper bondingpad 49, similar to the lower redistribution substrate 300L.

The second semiconductor package PK2 may include a package substrate710, a second semiconductor chip 200, and an upper mold layer 730. Thepackage substrate 710 may include a printed circuit board. In an exampleembodiment, a redistribution substrate may be used as the packagesubstrate 710. A lower conductive pad 705 may be disposed on a bottomsurface of the package substrate 710.

The second semiconductor chip 200 may be disposed on the packagesubstrate 710. The second semiconductor chip 200 may include integratedcircuits, and in an example embodiment, the integrated circuits mayinclude a memory circuit, a logic circuit, or combinations thereof. Achip pad 221 of the second semiconductor chip 200 may be electricallyconnected to an upper conductive pad 703, which is provided on a topsurface of the package substrate 710, in a wire bonding manner. Theupper conductive pad 703 on the top surface of the package substrate 710may be electrically connected to the lower conductive pad 705 through aninternal line in the package substrate 710.

The upper mold layer 730 may be provided on the package substrate 710 tocover the second semiconductor chip 200. The upper mold layer 730 may beformed of or include an insulating polymer (e.g., an epoxy-basedpolymer).

Third connection terminals 750 may be provided between the lowerconductive pad 705 of the package substrate 710 and the upper bondingpad 49. The third connection terminals 750 may be formed of or includeat least one of tin-containing metals of low melting temperatures (e.g.,soldering materials), but the inventive concepts are not limited to thisexample.

FIG. 16 is a sectional view illustrating a semiconductor package 2according to an example embodiment of the inventive concepts. FIG. 17 isan enlarged sectional view illustrating a portion ee of FIG. 16. For thesake of brevity, the elements and features of this example that aresimilar to those previously shown and described will not be described inmuch further detail.

Referring to FIGS. 16 and 17, in the semiconductor package 2 accordingto the present embodiment, the first semiconductor chip 100 may bedisposed in such a way that an active surface thereof is in contact withthe top surface of the lower redistribution substrate 300L, differentlyfrom the example embodiment of FIGS. 14 and 15.

The lower redistribution substrate 300L may include first to fourthinsulating layers 310, 320, 330, and 340, which are sequentially stackedon the chip pads 111 of the first semiconductor chip 100. The first andsecond redistribution patterns RDL1 and RDL2 may be disposed in thefirst to third insulating layers 310, 320, and 330.

The via portions V1 of the first redistribution patterns RDL1 may beconnected to the chip pads 111 of the first semiconductor chip 100.Although not shown, the via portions of the second redistributionpatterns RDL2 may be connected to the chip pads 111 of the firstsemiconductor chip 100. The first and second redistribution patternsRDL1 and RDL2 may be configured to have the same as or substantiallysimilar to the features described with reference to FIGS. 7, 8, and 9Ato 9C.

FIG. 18 is a sectional view illustrating a semiconductor packageaccording to an example embodiment of the inventive concepts. Referringto FIG. 18, a semiconductor package 3 according to the present exampleembodiment may include the first semiconductor package PK1 and thesecond semiconductor package PK2, which is disposed on the firstsemiconductor package PK1.

The first semiconductor package PK1 may include the redistributionsubstrate 300, and a connection substrate 400, the first semiconductorchip 100, and a mold layer 450 that are provided on the redistributionsubstrate 300.

The redistribution substrate 300 may include the insulating layers 310to 340 and the redistribution patterns RDL1 and RDL2, as describedabove.

The connection substrate 400 may have an opening that is formed toexpose the top surface of the redistribution substrate 300, and thefirst semiconductor chip 100 may be disposed in the opening of theconnection substrate 400. The connection substrate 400 may be providedbefore or after the providing of the first semiconductor chip 100. As anexample, the connection substrate 400 may be fabricated by forming ahole in a printed circuit board. The first semiconductor chip 100 may bedisposed to overlap a center portion of the redistribution substrate300, when viewed in a plan view.

The connection substrate 400 may include base layers 410 and conductivestructures 420. The base layers 410 may be formed of or include at leastone of insulating materials. For example, the base layers 410 may beformed of or include at least one of carbon-based, ceramic, or polymermaterials. The conductive structure 420 may include interconnectionpatterns and interconnection vias connecting them. The conductivestructures 420 of the connection substrate 400 may be connected to thefirst and second redistribution patterns RDL1 and RDL2 of theredistribution substrate 300. The conductive structure 420 may be formedof or include at least one of metallic materials. The conductivestructure 420 may be formed of or include at least one of, for example,copper, aluminum, gold, lead, stainless steel, silver, iron, or alloysthereof.

The mold layer 450 may be formed on the first semiconductor chip 100 andthe connection substrate 400. The mold layer 450 may be extended into agap between the first semiconductor chip 100 and the connectionsubstrate 400 to fill the gap. The mold layer 450 may be formed of orinclude at least one of insulating polymers (e.g., epoxy-basedpolymers). The mold layer 450 may expose portions of the conductivestructures 420 of the connection substrate 400.

The second semiconductor package PK2 may include the package substrate710, the second semiconductor chip 200, and the upper mold layer 730.The package substrate 710 may be a printed circuit board. In an exampleembodiment, a substrate like the redistribution substrate 300 may beused as the package substrate 710. The lower conductive pads 705 may bedisposed on the bottom surface of the package substrate 710.

The second semiconductor chip 200 may be disposed on the packagesubstrate 710. The second semiconductor chip 200 may include integratedcircuits, and the integrated circuits may include a memory circuit, alogic circuit, or combinations thereof. The chip pads 221 of the secondsemiconductor chip 200 may be electrically connected to the lowerconductive pads 705 through internal lines 715 provided in the packagesubstrate 710. The upper mold layer 730 may be provided on the packagesubstrate 710 to cover the second semiconductor chip 200. The upper moldlayer 730 may be formed of or include at least one of insulatingpolymers (e.g., epoxy-based polymers).

The third connection terminals 750 may be provided in upper holes of themold layer 450. The third connection terminals 750 may be in contactwith the conductive structures 420 and the lower conductive pad 705.

FIG. 19 is a plan view schematically illustrating a semiconductorpackage according to an example embodiment of the inventive concepts.FIG. 20 is a sectional view, which is taken along a line I-I′ of FIG. 19to illustrate a semiconductor package according to an example embodimentof the inventive concepts.

Referring to FIGS. 19 and 20, a semiconductor package 4 according to thepresent example embodiment may include first and second semiconductorchips 100 and 200, a redistribution substrate 300, a package substrate500, and a heat-dissipation structure 600.

The first and second semiconductor chips 100 and 200 may be disposed onthe top surface of the redistribution substrate 300.

The first semiconductor chip 100 may include the chip pads 111 providedon the bottom surface thereof. The first semiconductor chip 100 may be amicro electro mechanical systems (MEMS) device, an optoelectronicdevice, or a logic chip including processors (e.g., a central processingunit (CPU), a graphic processing unit (GPU), a mobile application chip,or a digital signal processor (DSP)). The first semiconductor chip 100may have a thickness ranging from about 700 μm to about 775 μm.

The second semiconductor chips 200 may be disposed on the redistributionsubstrate 300 to be spaced apart from the first semiconductor chip 100.Each of the second semiconductor chips 200 may include a plurality ofmemory chips 210, which are vertically stacked. The memory chips 210 maybe connected to each other through upper and lower chip pads 221 and223, chip penetration vias 225, and connection bumps 230. The memorychips 210 may be stacked on the redistribution substrate 300 in such away to have side surfaces that are aligned to each other. Adhesivelayers 235 may be provided between the memory chips 210, respectively.In an example embodiment, the adhesive layer 235 may be a polymer tape,which is formed of or includes an insulating material. The adhesivelayer 235 may be interposed between the connection bumps 230 to mitigateor prevent a short circuit from being formed between the connectionbumps 230.

The first and second semiconductor chips 100 and 200 may be connected tothe redistribution substrate 300 through the first connection terminals150. The first connection terminals 150 may be attached to the chip pads111 and 221 of the first and second semiconductor chips 100 and 200.Each of the first connection terminals 150 may be at least one of solderballs, conductive bumps, or conductive pillars.

The mold layer 370 may be provided on the redistribution substrate 300to cover the first and second semiconductor chips 100 and 200. A sidesurface of the mold layer 370 may be aligned to a side surface of theredistribution substrate 300. A top surface of the mold layer 370 may besubstantially coplanar with top surfaces of the first and secondsemiconductor chips 100 and 200. The mold layer 370 may be formed of orinclude at least one of insulating polymers (e.g., epoxy moldingcompound).

An under-fill layer UF may be interposed between the first semiconductorchip 100 and the redistribution substrate 300 and between the secondsemiconductor chips 200 and the redistribution substrate 300. Theunder-fill layer UF may be provided to fill a space between the firstconnection terminals 150. The under-fill layer UF may include, forexample, a thermo-curable resin or a photo-curable resin. In someexample embodiments, the under-fill layer UF may be omitted, and a spacebetween the bottom surfaces of the first and second semiconductor chips100 and 200 and the redistribution substrate 300 may be filled with themold layer 370.

The redistribution substrate 300 may be disposed on the packagesubstrate 500 and may be connected to the package substrate 500 throughthe second connection terminals 390.

The redistribution substrate 300 may include a plurality of insulatinglayers 310, 320, 330, 340, and 350, which are sequentially stacked, andredistribution patterns, which are provided in the insulating layers310, 320, 330, 340, and 350, respectively. The second connectionterminals 390 may be attached to the under-bump pattern UBM. The secondconnection terminals 390 may be solder balls, which are formed of tin,lead, copper, or the like. The second connection terminals 390 may havea thickness of about 40 μm to 80 μm.

The package substrate 500 may be, for example, a printed circuit board,a flexible substrate, a tape substrate, or the like. In an exampleembodiment, the package substrate 500 may be one of a flexible printedcircuit board, a rigid printed circuit board, or combinations thereof,in which internal lines 521 are provided.

The package substrate 500 may have a top surface and a bottom surface,which are opposite to each other, and may include upper coupling pads511, outer coupling pads 513, and internal lines 521. The upper couplingpads 511 may be arranged on the top surface of the package substrate500, and the outer coupling pads 513 may be arranged on the bottomsurface of the package substrate 500. The upper coupling pads 511 may beelectrically connected to the outer coupling pads 513 through theinternal lines 521. Outer coupling terminals 550 may be attached to theouter coupling pads 513. A ball grid array (BGA) may be provided as theouter coupling terminals 550.

The heat-dissipation structure 600 may be formed of or include at leastone of thermally conductive materials. The thermally conductivematerials may include metallic materials (e.g., copper and/or aluminum,and so forth) or carbon-containing materials (e.g., graphene, graphite,and/or carbon nanotube, and so forth). The heat-dissipation structure600 may have a relatively high thermal conductivity. As an example, asingle metal layer or a plurality of stacked metal layers may be used asthe heat-dissipation structure 600. As another example, theheat-dissipation structure 600 may include a heat sink or a heat pipe.As still another example, the heat-dissipation structure 600 may beconfigured using a water cooling method.

A thermally conductive layer 650 may be interposed between the first andsecond semiconductor chips 100 and 200 and the heat-dissipationstructure 600. The thermally conductive layer 650 may be in contact withthe top surface of the semiconductor package and the bottom surface ofthe heat-dissipation structure 600. The thermally conductive layer 650may be formed of or include a thermal interface material (TIM). Thethermal interface material may include, for example, polymer andthermally conductive particles. The thermally conductive particles maybe dispersed in the polymer. During the operation of the semiconductorpackage, heat produced in the semiconductor package may be transferredto the heat-dissipation structure 600 through the thermally conductivelayer 650.

According to an example embodiment of the inventive concepts, aredistribution substrate may include a redistribution pattern of a finewidth, and the redistribution pattern may include a metal pattern, whichis disposed in an insulating layer, and a seed/barrier pattern, which isprovided between a bottom surface of the metal pattern and theinsulating layer and between a side surface of the metal pattern and theinsulating layer. Because the seed/barrier pattern is interposed betweenthe side surface of the metal pattern and the insulating layer, it maybe possible to mitigate or prevent the metal pattern from being incontact with the insulating layer and thereby mitigating or preventingthe metal pattern from being unintentionally oxidized. Accordingly, itmay be possible to improve an integration density and reliability of theredistribution substrate.

While some example embodiments of the inventive concepts have beenparticularly shown and described, it will be understood by one ofordinary skill in the art that variations in form and detail may be madetherein without departing from the spirit and scope of the attachedclaims.

What is claimed is:
 1. A semiconductor package comprising: aredistribution substrate including an insulating layer andredistribution patterns in the insulating layer, wherein each of theredistribution patterns comprises a via portion, a pad portionvertically overlapping the via portion, and a line portion extendingfrom the pad portion, the via portion, the pad portion, and the lineportion are connected to each other to form a single object, a level ofa bottom surface of the pad portion is lower than a level of a bottomsurface of the line portion, and a width of the line portion has alargest value at a level between a top surface of the line portion andthe bottom surface of the line portion.
 2. The semiconductor package ofclaim 1, wherein a difference in the level between the bottom surface ofthe pad portion and the bottom surface of the line portion ranges from0.2 μm to 0.5 μm.
 3. The semiconductor package of claim 1, wherein adiameter of the pad portion has a largest value at a level between a topsurface of the pad portion and the bottom surface of the pad portion. 4.The semiconductor package of claim 1, wherein a difference between thelargest value of the width of the line portion and a width of the topsurface of the line portion is greater than 0 nm and is smaller than 300nm.
 5. The semiconductor package of claim 1, wherein each of theredistribution patterns comprises: a metal pattern in the insulatinglayer; and a seed/barrier pattern between a bottom surface of the metalpattern and the insulating layer and between a side surface of the metalpattern and the insulating layer.
 6. The semiconductor package of claim5, wherein an upper portion of the metal pattern has a groove portionnear the seed/barrier pattern.
 7. The semiconductor package of claim 6,wherein the groove portion has a depth greater than 0 nm and smallerthan 300 nm.
 8. The semiconductor package of claim 1, wherein a diameterof the pad portion is 1.5 times larger than the width of the lineportion.
 9. The semiconductor package of claim 1, wherein each of theredistribution patterns further comprises a second pad portion connectedto an end portion of the line portion such that the second pad portionand the line portion form a single object, and a level of a bottomsurface of the second pad portion is lower than the level of the bottomsurface of the line portion.
 10. A semiconductor package comprising: aredistribution substrate including an insulating layer andredistribution patterns in the insulating layer, wherein each of theredistribution patterns comprises a via portion, a pad portion, and aline portion that are connected to each other to form a single object,the pad portion vertically overlaps the via portion, the line portionextends from the pad portion, a level of a bottom surface of the padportion is lower than a level of a bottom surface of the line portion, aside surface of the via portion has a linear shape, and a side surfaceof the pad portion has a rounded shape.
 11. The semiconductor package ofclaim 10, wherein the side surface of the via portion comprises: a lowersidewall portion having a first slope; and an upper sidewall portionhaving a second slope, wherein the upper sidewall portion is connectedto the bottom surface of the pad portion, and an absolute value of thefirst slope is greater than an absolute value of the second slope. 12.The semiconductor package of claim 11, wherein an angle of the firstslope is smaller than 90°.
 13. The semiconductor package of claim 10,wherein the bottom surface of the pad portion and the side surface ofthe via portion are connected to form an edge portion having a roundedshape.
 14. The semiconductor package of claim 10, wherein each of theredistribution patterns comprises: a metal pattern in the insulatinglayer; and a seed/barrier pattern between a bottom surface of the metalpattern and the insulating layer and between a side surface of the metalpattern and the insulating layer.
 15. The semiconductor package of claim10, wherein an angle between the side surface of the via portion and abottom surface of the via portion is greater than 95°.
 16. Asemiconductor package comprising: a lower redistribution substrateincluding an insulating layer and first redistribution patterns in theinsulating layer; a first semiconductor chip on the lower redistributionsubstrate, the first semiconductor chip comprising chip pads; firstconnection terminals being between and connecting the lowerredistribution substrate and the chip pads of the first semiconductorchip; a mold layer on the lower redistribution substrate to cover thefirst semiconductor chip; metal pillars around the first semiconductorchip to penetrate the mold layer and connected to the lowerredistribution substrate; and an upper redistribution substrate on themold layer, the upper redistribution substrate comprising an upperinsulating layer and an upper redistribution pattern on the upperinsulating layer, wherein each of the first redistribution patternscomprises a first via portion, a first pad portion, and a first lineportion that are connected to each other to form a single object, thefirst pad portion vertically overlaps with the first via portion, thefirst line portion extends from the first pad portion, and a level of abottom surface of the first line portion is lowered with increasing adistance from a center portion of the first line portion in an outwarddirection.
 17. The semiconductor package of claim 16, wherein the firstline portion has a rounded edge portion between the bottom surface ofthe first line portion and a side surface of the first line portion, andthe rounded edge portion has a curvature radius of 0.3 μm or larger. 18.The semiconductor package of claim 16, wherein a difference between alevel of a center portion of the bottom surface of the first lineportion and a level of an edge portion of the bottom surface of thefirst line portion is greater than 0 nm and is smaller than 300 nm. 19.The semiconductor package of claim 16, wherein the lower redistributionsubstrate further comprises second redistribution patterns in theinsulating layer, the first redistribution patterns each have a smallestwidth of a first width at a top surface or a bottom surface thereof, thesecond redistribution patterns each have a smallest width of a secondwidth at a top surface or a bottom surface thereof, the second width islarger than the first width, the second redistribution patternscomprises a second line portion, and a level of a bottom surface of thesecond line portion is lower than the level of the bottom surface of thefirst line portion.
 20. The semiconductor package of claim 19, wherein atop surface of the first line portion and a top surface of the secondline portion are at a same level.